Add some browser tests for net-internals

chrome/test/data/webui/test_api.js

Index: chrome/test/data/webui/test_api.js
===================================================================
--- chrome/test/data/webui/test_api.js	(revision 94917)
+++ chrome/test/data/webui/test_api.js	(working copy)
@@ -493,7 +493,6 @@
    * @see createExpect
    **/
   function runTest(testFunction, testArguments) {
-    errors.splice(0, errors.length);
     // Avoid eval() if at all possible, since it will not work on pages
     // that have enabled content-security-policy.
     var testBody = this[testFunction];    // global object -- not a method.
@@ -504,6 +503,24 @@
           testFunction.name ? testFunction.name : testBody.toString();
       console.log('Running test ' + testName);
     }
+    return runTestFunction(testFunction, testBody, testArguments);
+  }
+
+  /**
+   * This is the guts of WebUIBrowserTest. It clears |errors|, runs the
+   * test surrounded by an expect to catch Errors. If |errors| is
+   * non-empty, it reports a failure and a message by joining |errors|.
+   * Consumers can use this to use assert/expect functions asynchronously,
+   * but are then responsible for reporting errors to the browser themselves.
+   * @param {string} testFunction The function name to report on failure.
+   * @param {Function} testBody The function to call.
+   * @param {Array} testArguments The arguments to call |testBody| with.
+   * @return {Array.<boolean, string>} [test-succeeded, message-if-failed]
+   * @see errors
+   * @see createExpect
+   **/
+  function runTestFunction(testFunction, testBody, testArguments) {
+    errors.splice(0, errors.length);
     createExpect(testBody).apply(null, testArguments);
 
     var result = [true];
@@ -719,6 +736,7 @@
   window.registerMessageCallback = registerMessageCallback;
   window.registerMockMessageCallbacks = registerMockMessageCallbacks;
   window.runTest = runTest;
+  window.runTestFunction = runTestFunction;
   window.SaveArgumentsMatcher = SaveArgumentsMatcher;
   window.TEST = TEST;
   window.TEST_F = TEST_F;